In spring, overwintering vegetables in solar greenhouses enter the stage of large-scale production. Fruits and vegetables in winter and spring gradually transition from the growth stage to the harvest stage. Vegetables in plastic greenhouses are at the peak of spring planting, and overwintering field vegetables are gradually returning to growth. At this stage, vegetable production management requires strong technical capabilities, and preventive measures must be taken to prevent the occurrence of sudden weather such as late spring frost and spring drought.
Solar Greenhouse Vegetables Management
- Greenhouse temperature management: Keep vegetables in winter at a daytime temperature of 26-32°C and a nighttime temperature of 18-20°C. For winter and spring fruits and vegetables, the daytime temperature should be controlled at 28-30°C, and the nighttime temperature should be controlled at 13-15°C. During cold waves, temporary heating measures such as hanging films, using heating blocks or hot air fans can be taken.
- Greenhouse lighting management: When the temperature rises, promptly remove the insulation blanket to extend the lighting time. Keep the shed film clean and uncover the insulation blanket on cloudy days to diffuse light. When it is cloudy for a long time, the plants should be shaded from the sun and use reflective film to enhance the light.
- Greenhouse humidity should be reduced by managing ventilation and using appropriate irrigation methods such as subsurface drip irrigation or micro-sprinklers. Mulching the rows with rice husks or cornstalks will also help reduce humidity. Adjust ventilation according to crop growth conditions and indoor temperature, and short-term ventilation should not exceed 20 minutes. Turning on ventilation around noon during periods of continuous overcast, rainy or snowy weather can also help control humidity.
- Water and fertilizer management. The principle of fertilizing winter vegetable crops in solar greenhouses is to apply water-soluble fertilizer in small amounts multiple times, with the dosage of 2-5 kg per acre each time. To promote recovery and growth of roots and plants, seaweed extracts, fish proteins, biofertilizers and chitosan materials are recommended. Foliar fertilizer should be applied in the early morning or evening. It should not be applied at noon on sunny days to avoid phytotoxicity caused by evaporation and concentration of fertilizer. For winter and spring vegetable crops, irrigation should be minimized from transplanting to fruit setting. If the soil is dry, apply a small amount of water and use seaweed extract and biofertilizer. When watering is not needed, fertilizer can be sprayed on the leaves, and attention should be paid to supplementing phosphorus, calcium, and boron. If the plant node spacing is long, it can be adjusted by appropriately controlling water, nitrogen, and night temperature, and using growth regulators with caution.
Post time: Jan-15-2024
